At the MLB All-Star Game on Tuesday night at San Diego's Petco Park, one of the singers performing "O Canada" went rogue and inserted an "all lives matter" reference into the lyrics.

According to a statement released by the Canadian quartet the Tenors, one member, Remigio Pereira, sneakily changed the words of the song during his solo in the middle of the group's performance.

Correction: The Tenors altered O Canada lyrics in support of All Lives Matter.pic.twitter.com/Q0i6qqLB4Y

Instead of singing "With glowing hearts we see thee rise/ The True North strong and free," Pereira can be heard singing, "We're all brothers and sisters/ All lives matter to the great." He also holds up a tiny, handwritten sign to drive home his point.

What "all lives matter" really means: "All lives matter" is a refrain often used as a response to the Black Lives Matter movement, which seeks to counter police brutality and racial injustice through empathy and understanding. "All lives matter," however, is "a complete misunderstanding of what the phrase 'black lives matter' means," wrote Vox's German Lopez. "The person on the receiving end interprets the phrase as 'black lives matter more than any other lives.'"

To quote Black Lives Matter co-founder Alicia Garza, "When we deploy 'all lives matter' as to correct an intervention specifically created to address anti-blackness, we lose the ways in which the state apparatus has built a program of genocide and repression mostly on the backs of black people."

Unsurprisingly, the social media backlash to the Tenors was swift:

Memo to MLB: if you're looking to attract black fans and players, All Lives Mattering the anthem -- even O Canada -- ain't the way to do it.

Dear Tenors....political statements are to be made on your own time not when you're singing our National Anthem. Signed Canada

Canada fact: The Tenors used to be called The Canadian Tenors but they aren't anymore, and good call, because they do NOT speak for us

The apology: In a statement released by the group later that night, the Tenors acknowledged the "extremely selfish" actions of Pereira, who acted as a "lone wolf." They said Pereira would not be performing with the group "until further notice."

pic.twitter.com/3rHG1e1Akf

Pereira responded by saying his message was about unity and positivity.

I've been so moved lately by the tragic loss of life and I hoped for a positive statement that would bring us ALL together. ONE LOVE.

One big oversight: The Tenors apologized to "everybody who witnessed this shameful act, to our fellow Canadians, to Major League Baseball, to our friends, families, fans and to all those affected." The apology did not mention the black community, arguably the group most affected by the whole fiasco.